136121591520 has 72 divisors (see below), whose sum is σ = 464514935976. Its totient is φ = 36299090688.

The previous prime is 136121591477. The next prime is 136121591527. The reversal of 136121591520 is 25195121631.

It is a happy number.

136121591520 is a `hidden beast` number, since 1 + 3 + 6 + 12 + 1 + 591 + 52 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136121591527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47263002 + ... + 47265881.

It is an arithmetic number, because the mean of its divisors is an integer number (6451596333).

Almost surely, 2^136121591520 is an apocalyptic number.

136121591520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

136121591520 is an abundant number, since it is smaller than the sum of its proper divisors (328393344456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

136121591520 is a wasteful number, since it uses less digits than its factorization.

136121591520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94528904 (or 94528893 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The spelling of 136121591520 in words is "one hundred thirty-six billion, one hundred twenty-one million, five hundred ninety-one thousand, five hundred twenty".